From patchwork Tue Aug 2 18:46:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Senna Tschudin X-Patchwork-Id: 9260189 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B839560865 for ; Tue, 2 Aug 2016 18:49:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A5F03284E2 for ; Tue, 2 Aug 2016 18:49:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9A530284F6; Tue, 2 Aug 2016 18:49:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 09E11284E2 for ; Tue, 2 Aug 2016 18:49:06 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bUeiu-0006CK-1l; Tue, 02 Aug 2016 18:47:28 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bUeip-0006Bf-6l for linux-arm-kernel@lists.infradead.org; Tue, 02 Aug 2016 18:47:24 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: peter) with ESMTPSA id 2D2E52611F5 Date: Tue, 2 Aug 2016 20:46:55 +0200 From: Peter Senna Tschudin To: Philipp Zabel Subject: Re: [PATCH V3 1/5] drm/imx-ldb: Add support to drm-bridge Message-ID: <20160802184655.GA21085@collabora.com> References: <1464626385-19253-1-git-send-email-peter.senna@collabora.com> <5d55969a1509de751dc550d9a02bd5070455f99b.1469993472.git.peter.senna@collabora.com> <1470046870.3025.36.camel@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1470046870.3025.36.camel@pengutronix.de> User-Agent: Mutt/1.6.2 (2016-07-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160802_114723_603912_A8E68A40 X-CRM114-Status: GOOD ( 18.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, airlied@linux.ie, dri-devel@lists.freedesktop.org, Thierry Reding , ykk@rock-chips.com, boris.brezillon@free-electrons.com, architt@codeaurora.org, linux@armlinux.org.uk, geert@linux-m68k.org, treding@nvidia.com, linux@roeck-us.net, devicetree@vger.kernel.org, andrey.gusakov@cogentembedded.com, fabio.estevam@nxp.com, robh+dt@kernel.org, mchehab@kernel.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, enric.balletbo@collabora.com, akpm@linux-foundation.org, shawnguo@kernel.org, davem@davemloft.net Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Hi Philipp, Thank you for the review. I'm preparing V4, what about this: --- drivers/gpu/drm/imx/imx-ldb.c | 118 ++++++++++++++++++++++++++++-------------- 1 file changed, 78 insertions(+), 40 deletions(-) diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index b03919e..4a33077 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -57,7 +57,11 @@ struct imx_ldb_channel { struct imx_ldb *ldb; struct drm_connector connector; struct drm_encoder encoder; + + /* Defines what is connected to the ldb, only one at a time */ struct drm_panel *panel; + struct drm_bridge *bridge; + struct device_node *child; struct i2c_adapter *ddc; int chno; @@ -466,10 +470,30 @@ static int imx_ldb_register(struct drm_device *drm, drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs, DRM_MODE_ENCODER_LVDS, NULL); - drm_connector_helper_add(&imx_ldb_ch->connector, - &imx_ldb_connector_helper_funcs); - drm_connector_init(drm, &imx_ldb_ch->connector, - &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS); + if (imx_ldb_ch->bridge) { + imx_ldb_ch->bridge->encoder = encoder; + + imx_ldb_ch->encoder.bridge = imx_ldb_ch->bridge; + ret = drm_bridge_attach(drm, imx_ldb_ch->bridge); + if (ret) { + DRM_ERROR("Failed to initialize bridge with drm\n"); + return ret; + } + } else { + /* + * We want to add the connector whenever there is no bridge + * that brings its own, not only when there is a panel. For + * historical reasons, the ldb driver can also work without + * a panel. + */ + drm_connector_helper_add(&imx_ldb_ch->connector, + &imx_ldb_connector_helper_funcs); + drm_connector_init(drm, &imx_ldb_ch->connector, + &imx_ldb_connector_funcs, + DRM_MODE_CONNECTOR_LVDS); + drm_mode_connector_attach_encoder(&imx_ldb_ch->connector, + encoder); + } if (imx_ldb_ch->panel) { ret = drm_panel_attach(imx_ldb_ch->panel, @@ -478,8 +502,6 @@ static int imx_ldb_register(struct drm_device *drm, return ret; } - drm_mode_connector_attach_encoder(&imx_ldb_ch->connector, encoder); - return 0; } @@ -548,6 +570,45 @@ static const struct of_device_id imx_ldb_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids); +static int imx_ldb_panel_ddc(struct device *dev, + struct imx_ldb_channel *channel, struct device_node *child) +{ + struct device_node *ddc_node; + const u8 *edidp; + int ret; + + ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0); + if (ddc_node) { + channel->ddc = of_find_i2c_adapter_by_node(ddc_node); + of_node_put(ddc_node); + if (!channel->ddc) { + dev_warn(dev, "failed to get ddc i2c adapter\n"); + return -EPROBE_DEFER; + } + } + + if (!channel->ddc) { + /* if no DDC available, fallback to hardcoded EDID */ + dev_dbg(dev, "no ddc available\n"); + + edidp = of_get_property(child, "edid", + &channel->edid_len); + if (edidp) { + channel->edid = kmemdup(edidp, + channel->edid_len, + GFP_KERNEL); + } else if (!channel->panel) { + /* fallback to display-timings node */ + ret = of_get_drm_display_mode(child, + &channel->mode, + OF_USE_NATIVE_MODE); + if (!ret) + channel->mode_valid = 1; + } + } + return 0; +} + static int imx_ldb_bind(struct device *dev, struct device *master, void *data) { struct drm_device *drm = data; @@ -555,7 +616,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) const struct of_device_id *of_id = of_match_device(imx_ldb_dt_ids, dev); struct device_node *child; - const u8 *edidp; struct imx_ldb *imx_ldb; int dual; int ret; @@ -605,7 +665,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) for_each_child_of_node(np, child) { struct imx_ldb_channel *channel; - struct device_node *ddc_node; struct device_node *ep; int bus_format; @@ -638,46 +697,25 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) remote = of_graph_get_remote_port_parent(ep); of_node_put(ep); - if (remote) + if (remote) { channel->panel = of_drm_find_panel(remote); - else + channel->bridge = of_drm_find_bridge(remote); + } else return -EPROBE_DEFER; of_node_put(remote); - if (!channel->panel) { - dev_err(dev, "panel not found: %s\n", - remote->full_name); - return -EPROBE_DEFER; - } - } - ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0); - if (ddc_node) { - channel->ddc = of_find_i2c_adapter_by_node(ddc_node); - of_node_put(ddc_node); - if (!channel->ddc) { - dev_warn(dev, "failed to get ddc i2c adapter\n"); + if (!channel->panel && !channel->bridge) { + dev_err(dev, "panel/bridge not found: %s\n", + remote->full_name); return -EPROBE_DEFER; } } - if (!channel->ddc) { - /* if no DDC available, fallback to hardcoded EDID */ - dev_dbg(dev, "no ddc available\n"); - - edidp = of_get_property(child, "edid", - &channel->edid_len); - if (edidp) { - channel->edid = kmemdup(edidp, - channel->edid_len, - GFP_KERNEL); - } else if (!channel->panel) { - /* fallback to display-timings node */ - ret = of_get_drm_display_mode(child, - &channel->mode, - OF_USE_NATIVE_MODE); - if (!ret) - channel->mode_valid = 1; - } + /* panel ddc only if there is no bridge */ + if (!channel->bridge) { + ret = imx_ldb_panel_ddc(dev, channel, child); + if (ret) + return ret; } bus_format = of_get_bus_format(dev, child);